diff --git a/serialport/proguard-rules.pro b/serialport/proguard-rules.pro
index ded416c..82a4d59 100644
--- a/serialport/proguard-rules.pro
+++ b/serialport/proguard-rules.pro
@@ -1 +1,5 @@
-IyBBZGQgcHJvamVjdCBzcGVjaWZpYyBQcm9HdWFyZCBydWxlcyBoZXJlLgota2VlcCBjbGFzcyBhbmRyb2lkLnNlcmlhbHBvcnQudXRpbHMuU2VyaWFsQ2FyZENvbnRyb2wgewogICAgYW5kcm9pZC5zZXJpYWxwb3J0LnV0aWxzLlNlcmlhbENhcmRDb250cm9sIGdldFNlcmlhbEFsYXJtSW5zdGFuY2UqKC4uLik7Cn0KLWtlZXAgY2xhc3MgYW5kcm9pZC5zZXJpYWxwb3J0LnV0aWxzLlRhc2tFeGN1dGVSZXN1bHQgeyAqOyB9
\ No newline at end of file
+# Add project specific ProGuard rules here.
+-keep class android.serialport.utils.SerialCardControl {
+    android.serialport.utils.SerialCardControl getSerialAlarmInstance*(...);
+}
+-keep class android.serialport.utils.TaskExcuteResult { *; }
\ No newline at end of file